Can congo tetras live with black skirt tetras?

Verdict
Yes

Yes, congo tetras and black skirt tetras can live together. Both are fine at 73–80°F. Plan on at least 30 gal.

Congo tetraCongo tetra73–82°F · pH 6–7.5 Black skirt tetraBlack skirt tetra70–80°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–80°Congo tetra 73–82°Black skirt tetra 70–80°
The green band is the temperature range both can live in.
456789Both: 6–7.5Congo tetra 6–7.5Black skirt tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Congo tetra · 3 inBlack skirt tetra · 2.5 in0"1"2"3"4"5"6"
Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

Congo tetraBlack skirt tetra
Temperature73–82 °F70–80 °F
pH6–7.56–7.5
Adult size3.0 in2.5 in
Minimum tank30 gal15 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for congo tetras

All congo tetra tank mates

Better tank mates for black skirt tetras

All black skirt tetra tank mates

Questions

Can congo tetras live with black skirt tetras?

Yes, congo tetras and black skirt tetras can live together. Both are fine at 73–80°F. Plan on at least 30 gal.

What temperature suits both congo tetras and black skirt tetras?

73–80 °F. Congo tetras need 73–82 °F, black skirt tetras need 70–80 °F.

What size tank do congo tetras and black skirt tetras need together?

At least 30 gal, set by the congo tetra. Add space for each extra fish.